Do you need to have a "business" account, for services like electricity to a business?

Our workshop electricity bill is constantly insane, despite relatively low consumption.

If I plug in our residential rates against our workshop usage, it would be at least 30% lower for the same consumption.

Is there an actual need for a "business" account at a business address? My understanding of business accounts is that they offer higher levels of support and a faster resolution time, but when poo has hit the fan (such as flooding) we're not restored any faster than the houses nearby anyway.

Seems bollocks to pay quite a bit extra as a business when the usage is comparable to a residential address.

This also applies to internet which is more expensive for a business account with no difference in SLA.